Project Introduction

Anatacau Main is one of Brunswick Exploration Inc.’s (BRW) highly prospective lithium pegmatite exploration assets located in Quebec’s James Bay–Eeyou Istchee region, a globally recognized jurisdiction for hard-rock lithium exploration and development.

In the fall of 2022, BRW entered into an option agreement with Osisko Development Corp. (TSX-V: ODEV) to acquire a 90% interest in the Anatacau Property, securing a strategic land position within an emerging lithium district.

During the summer of 2023, BRW announced the discovery of a significant spodumene-bearing pegmatite outcrop, known as the Anaïs Showing, measuring at least 100 metres in strike length and approximately 15 metres in width at surface. The Anaïs Showing occurs within a cluster of pegmatite dykes, all of which host high-grade lithium mineralization, highlighting the robust nature of the mineralized system (see July 13th, 2023, press release).

The Anatacau Main Project is strategically located 22 kilometres east of BRW’s Anatacau West Project and Rio Tinto’s James Bay lithium project (formerly Galaxy Lithium), along a large-scale east–west-trending deformation corridor. This regional structure is known to control lithium-bearing pegmatite emplacement and extends across both the Anatacau West and Anatacau Main properties over a combined strike length of approximately 15.5 kilometres.

The project’s strategic location, geological setting, and demonstrated high-grade mineralization position Anatacau Main as a high-impact exploration opportunity within Quebec’s rapidly advancing lithium sector.

Figure 1: Localisation map of BRW projects in the James Bay area
Figure 1: Localisation map of BRW projects in the James Bay area
Figure 2: Closeup localisation map of Anatacau main and Anatacau west properties
Figure 2: Closeup localisation map of Anatacau main and Anatacau west properties

Maiden Drill Program

Brunswick Exploration completed a maiden diamond drilling program at the Anaïs Showing in the fall of 2025. The program comprised six drill holes totaling 795 metres, with all holes intersecting significant lithium mineralization, underscoring the strength and continuity of the system at an early stage.

Drilling returned excellent lithium intercepts, including 120.7 metres grading 1.31% Li₂O and 53.9 metres grading 1.53% Li₂O (see November 17th, 2025 and December 1st, 2025 press release). These results demonstrate substantial thicknesses and robust grades, highlighting the discovery potential of the Anaïs Showing.

The maiden drilling also confirmed significant thickening of spodumene-bearing pegmatites at depth and suggests the presence of multiple stacked pegmatite dykes dipping moderately to steeply toward the west-northwest. This mineralization style closely mirrors that observed at Rio Tinto’s James Bay lithium project and BRW’s Anatacau West Project, reinforcing the geological continuity and district-scale potential of the Anatacau Main Project.

These early drill results position Anatacau Main as a highly compelling growth opportunity within BRW’s Quebec lithium portfolio.

Figure 3: Surface Map of the Anatacau Main Project and Drill Holes Completed to date
Figure 3: Surface Map of the Anatacau Main Project and Drill Holes Completed to date
Figure 4: Cross Section A-A’ (see Figure 3 for localisation, Section is 65 meters thick)
Figure 4: Cross Section A-A’ (see Figure 3 for localisation, Section is 65 meters thick)
Figure 5: Cross Section B-B’ (see Figure 3 for localisation, section is 65 meters thick)
Figure 5: Cross Section B-B’ (see Figure 3 for localisation, section is 65 meters thick)
Figure 6: Complete Mineralized Intercepts from the Inaugural Drilling Program at Anatacau Main
Figure 6: Complete Mineralized Intercepts from the Inaugural Drilling Program at Anatacau Main
Figure 7: Drillhole collar table for the inaugural drilling program
Figure 7: Drillhole collar table for the inaugural drilling program
Anatacau - Main geology map
Project map geology - Anatacau